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path: root/drivers/power/reset/reboot-mode.c
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Diffstat (limited to 'drivers/power/reset/reboot-mode.c')
-rw-r--r--drivers/power/reset/reboot-mode.c195
1 files changed, 195 insertions, 0 deletions
diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
new file mode 100644
index 0000000000..b4076b10b8
--- /dev/null
+++ b/drivers/power/reset/reboot-mode.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/reboot.h>
+#include <linux/reboot-mode.h>
+
+#define PREFIX "mode-"
+
+struct mode_info {
+ const char *mode;
+ u32 magic;
+ struct list_head list;
+};
+
+static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboot,
+ const char *cmd)
+{
+ const char *normal = "normal";
+ int magic = 0;
+ struct mode_info *info;
+
+ if (!cmd)
+ cmd = normal;
+
+ list_for_each_entry(info, &reboot->head, list) {
+ if (!strcmp(info->mode, cmd)) {
+ magic = info->magic;
+ break;
+ }
+ }
+
+ return magic;
+}
+
+static int reboot_mode_notify(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ struct reboot_mode_driver *reboot;
+ unsigned int magic;
+
+ reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
+ magic = get_reboot_mode_magic(reboot, cmd);
+ if (magic)
+ reboot->write(reboot, magic);
+
+ return NOTIFY_DONE;
+}
+
+/**
+ * reboot_mode_register - register a reboot mode driver
+ * @reboot: reboot mode driver
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int reboot_mode_register(struct reboot_mode_driver *reboot)
+{
+ struct mode_info *info;
+ struct property *prop;
+ struct device_node *np = reboot->dev->of_node;
+ size_t len = strlen(PREFIX);
+ int ret;
+
+ INIT_LIST_HEAD(&reboot->head);
+
+ for_each_property_of_node(np, prop) {
+ if (strncmp(prop->name, PREFIX, len))
+ continue;
+
+ info = devm_kzalloc(reboot->dev, sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ if (of_property_read_u32(np, prop->name, &info->magic)) {
+ dev_err(reboot->dev, "reboot mode %s without magic number\n",
+ info->mode);
+ devm_kfree(reboot->dev, info);
+ continue;
+ }
+
+ info->mode = kstrdup_const(prop->name + len, GFP_KERNEL);
+ if (!info->mode) {
+ ret = -ENOMEM;
+ goto error;
+ } else if (info->mode[0] == '\0') {
+ kfree_const(info->mode);
+ ret = -EINVAL;
+ dev_err(reboot->dev, "invalid mode name(%s): too short!\n",
+ prop->name);
+ goto error;
+ }
+
+ list_add_tail(&info->list, &reboot->head);
+ }
+
+ reboot->reboot_notifier.notifier_call = reboot_mode_notify;
+ register_reboot_notifier(&reboot->reboot_notifier);
+
+ return 0;
+
+error:
+ list_for_each_entry(info, &reboot->head, list)
+ kfree_const(info->mode);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(reboot_mode_register);
+
+/**
+ * reboot_mode_unregister - unregister a reboot mode driver
+ * @reboot: reboot mode driver
+ */
+int reboot_mode_unregister(struct reboot_mode_driver *reboot)
+{
+ struct mode_info *info;
+
+ unregister_reboot_notifier(&reboot->reboot_notifier);
+
+ list_for_each_entry(info, &reboot->head, list)
+ kfree_const(info->mode);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(reboot_mode_unregister);
+
+static void devm_reboot_mode_release(struct device *dev, void *res)
+{
+ reboot_mode_unregister(*(struct reboot_mode_driver **)res);
+}
+
+/**
+ * devm_reboot_mode_register() - resource managed reboot_mode_register()
+ * @dev: device to associate this resource with
+ * @reboot: reboot mode driver
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int devm_reboot_mode_register(struct device *dev,
+ struct reboot_mode_driver *reboot)
+{
+ struct reboot_mode_driver **dr;
+ int rc;
+
+ dr = devres_alloc(devm_reboot_mode_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ rc = reboot_mode_register(reboot);
+ if (rc) {
+ devres_free(dr);
+ return rc;
+ }
+
+ *dr = reboot;
+ devres_add(dev, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_reboot_mode_register);
+
+static int devm_reboot_mode_match(struct device *dev, void *res, void *data)
+{
+ struct reboot_mode_driver **p = res;
+
+ if (WARN_ON(!p || !*p))
+ return 0;
+
+ return *p == data;
+}
+
+/**
+ * devm_reboot_mode_unregister() - resource managed reboot_mode_unregister()
+ * @dev: device to associate this resource with
+ * @reboot: reboot mode driver
+ */
+void devm_reboot_mode_unregister(struct device *dev,
+ struct reboot_mode_driver *reboot)
+{
+ WARN_ON(devres_release(dev,
+ devm_reboot_mode_release,
+ devm_reboot_mode_match, reboot));
+}
+EXPORT_SYMBOL_GPL(devm_reboot_mode_unregister);
+
+MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
+MODULE_DESCRIPTION("System reboot mode core library");
+MODULE_LICENSE("GPL v2");